JPH0125362Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electrical appliance that is attached to a panel such as a control panel or a switchboard.

[Conventional technology]

Generally, the terminals of electrical appliances attached to panels such as control boards and switchboards are exposed inside the panel. For this reason, in the case of maintenance, inspection, etc., when opening the panel while the wires are live, an accident may occur in which a worker touches the terminal and receives an electric shock.

In order to prevent this electric shock accident, as shown in Figure 3, it is necessary to
After installing electric appliances 3 to the electric appliances 3 and wiring 4 to these electric appliances 3, an insulating plate 5 that covers the entire electric appliances 3 is attached to the door panel 2 with a plurality of bolts 6, and as shown in FIG. As shown, it is necessary to attach an insulating cover 7 covering the terminal portion 3a of the electric appliance 3A to the electric appliance 3A to be attached to the door panel 2 using a plurality of mounting bolts 8.

By the way, among electrical appliances, there are especially electric appliances called switches, which are attached to door panels and which move a movable contact by pressing a push button or turning a twist knob, and then bring it into contact with a fixed contact to close the circuit. Instruments are used for many purposes.

5 and 6 show two embodiments of electrical appliances according to the prior art. In the figure, 11
is a base, and is attached to the door panel 13 by a nut 12 that is screwed into a threaded portion of the base 11. The base 11 has a cylindrical shape with a stepped hole, and is supported so that the push button 15 is biased upward by a back spring 14 housed inside and can be moved downward. are doing. 16 is a gasket for preventing dust. The upper end of a support body 17 is attached to the push button 15, so that the push button 15 can be moved downward together with the push button 15. A flange 18 is provided above the hole in the support body 17 to prevent the push button 15 from falling upward due to the elastic force of the back spring 14. The support body 17
A vertically long hole 19 is provided in the upper part of the
A movable contact 20 is supported at the bottom of this hole 19. Note that a contact spring 21 is housed inside this hole 19 and presses the movable contact 20 downward. The movable contact 20 faces a fixed contact 23 installed inside a switch box 22, which will be described next.

The intermediate portion of the base 11, that is, the lower portion of the gasket 24 when attached to the door panel 13, is a flange portion 25, and a groove 26 and a step portion 27 are formed in the lower portion of the flange portion 25. An engaging arm 28 is formed on the upper part of the switch box 22, and is adapted to attach the switch box 22 to the base 11 by engaging with the stepped portion 27. In the case of Figure 6, the flange part 2 of the one in Figure 5
It shows the one without 5. FIG. 7 is a perspective view thereof.

As shown in FIG. 5, an engaging protrusion 29 is formed at the rear end of the switch box 22. As shown in FIG. This engaging protrusion 29 has the same shape as the stepped portion 27 provided on the base 11, and is used when attaching another switch box to the rear end of the switch box 22. There is. 30 in FIG. 5 is a back spring, and 31 in FIG. 6 is a terminal screw.

[The problem that the idea attempts to solve]

When an insulating plate or an insulating cover is applied to an electric appliance configured as described above to prevent electric shock accidents, it takes many man-hours to install and remove it, making maintenance and inspection difficult, and the total cost in actual use is high. The cost will be higher. It is not a good idea to use such insulating plates or insulating covers, which require laborious installation and removal work, for panel-mounted electric appliances that are desired to be inexpensive.

In addition, for panel-mounted electrical appliances,
After installation on the door panel, it is often used in places where maintenance and inspection only need to be performed from the front side of the panel.In this case, an insulating cover for the terminal part is not required, making it easy to selectively install and remove the insulating cover. It was hoped that it would be possible.

Furthermore, in some uses of electrical appliances, the specifications may be changed later and the number of contacts may be increased or decreased, but this has been difficult to do with conventional electrical appliances. That is, in a conventional electric appliance, when it is necessary to change the specifications during use and the switch box 22 is to be removed, the base 11
If it remains attached to the door panel 13, it becomes obstructive and the engaging arm 28 cannot be opened outward, making it impossible to remove the switch box 22. In order to improve this problem, if a gap is provided in the section A in FIG. 5 to accommodate a flat object such as a screwdriver, the overall length will become longer.

This idea was created in view of the above problems.
The purpose of this is to make it easy to attach and detach the switch box from the base, and in particular to make it easy to attach and remove the insulating cover that covers the terminals that protrude from the switch box to the outside. The object of the present invention is to provide an electric appliance that has a simple structure and is easy to maintain and inspect.

[Means to solve the problem]

The above purpose is to provide a base that is attached to a panel such as a control panel or a power distribution board and houses an operating unit, and a movable contact that is detachably attached to the rear of the base and that makes fixed contact with a movable contact that is opened and closed by the operating unit. In an electrical appliance comprising a switch box containing a switch and an insulating cover covering a terminal portion protruding from the switch box to the outside, the base is provided with protruding hooking legs having holes on both sides of the lower part. The switch box has protrusions on both sides of the upper part that engage with holes in the hook legs of the base from the inside, and when the hook legs are engaged with the protrusions, there is a gap on the underside of the hook legs. The insulating cover has a guide groove forming a guide groove, and a hooking leg having a hole is provided protruding from both sides of the lower part, and the insulating cover has a protrusion on both sides of the upper part that engages with the hole of the hooking leg of the switch box. This is accomplished by an electrical appliance that is detachably attached to the switch box.

[Effect]

In the electrical appliance configured as described above, the switch box can be attached to the base simply by press-fitting the switch box between the two hooking legs of the base, and the hooking legs of the base are pushed outward. This is completed by fitting the protrusion of the flexible switch box into the hole of the hooking leg. Here, when it becomes necessary to remove the switch box from the base due to a change in specifications, etc., the gap between the bottom of the hanging legs of the base, i.e.
Insert a flat object, such as the tip of a screwdriver, from diagonally downward into the gap formed by the guide groove of the switch box, and use this to open the hooking legs of the base outward. Since the engaging leg of the base is disengaged from the hole, the switch box can be easily removed. At this time, the guide groove into which the flat object is inserted is formed in the switch box located below the base and is sufficiently far away from the panel, so the flat object can be inserted and removed smoothly. Able to perform work.

In addition, when attaching or removing the insulating cover that covers the terminals to prevent electric shock from the switch box, bend both hooking legs of the switch box outward. This can be done easily by inserting the protrusion of the insulating cover into the hole of the hooking leg and by disengaging the hole of the hooking leg of the switch box from the protrusion of the insulating cover, making maintenance and inspection easy. Become something.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to an embodiment shown in FIGS. 1 and 2. In the description of this embodiment, the same parts as those of the conventional example shown in FIG.

In the embodiment shown in FIGS. 1 and 2, 32
1 is a base, and this base 32 is made of an elastic synthetic resin material, and hooking legs 34 having holes 33 on both sides of the rear part are integrally formed. Further, a step portion 35 is formed at the bottom of the hole 33. Reference numeral 36 denotes a switch box, and a projection 37 is provided at the upper end of the switch box 36, and the hole 33 of the hooking leg 34 on the base 32 side is provided with a protrusion 37.
and is adapted to engage with the stepped portion 35.
Then, the protrusion 37 is attached to the lower part of the protrusion 37.
A guide groove 46 is provided that forms a gap 38 that is large enough to accommodate a flat object (not shown) such as a screwdriver as a removal jig when engaged with the hole 33 of No. 4. Hooking legs 39 having the same shape and dimensions as the hooking legs 34 provided on both rear sides of the base 32 are provided on both rear sides of the switch box 36. A hole 40 is formed in this hooking leg 39, and a stepped portion 41 is formed at the bottom of this hole 40. Height B of the hanging leg 39 from the bottom of the switch box 36
is the support 1 that moves downward when the push button 15 is pressed.
It almost matches the amount of movement of 7.

Reference numeral 42 denotes an insulating cover that engages with the engaging legs 39 of the switch box 36, and this insulating cover 42 includes an insulating cover main body 43 formed in a box shape from a transparent insulating material, and the above-mentioned engaging legs formed on the insulating cover main body 43. leg 39
and a driver guide hole 45 into which a driver for rotating the terminal screw 31 formed in the insulating cover body 43 can be inserted. In addition, the insulation cover body 43
The rear end of the switch box 36 and the rear end of the switch box 36 are formed so as not to come into contact even if the support body 17 moves.

With this structure, when it becomes necessary to remove the switch box 36 from the base 32, insert a flat object such as the tip of a screwdriver into the guide groove 46 that forms the gap 38, and use this to remove the switch box 36 from the base 32. If the engaging leg 34 is opened outward by prying up the part 35, the engagement between the stepped part 35 and the protrusion 37 will be released.
The switch box 36 can be easily removed. In this case, the gap 38 is sufficiently far away from the panel 18, so that it will not have any effect on the use of the flat object.

When the switch boxes 36 have to be stacked due to specification changes during use, they are connected using the hook legs 39 provided at the rear of the switch boxes 36. At this time, in order for the hanging legs 34 and 39 to have a certain amount of deflection, holes are provided in the base 32 and the switch box 36.
3,40 are provided. With this, the hanging leg 3
The length of 4,39, and thus the overall length, can be reduced.

Furthermore, by attaching the insulating cover 42 to the latch leg 39 of the switch box 36 only in the position that is touched when the door is opened, electric shock can be prevented, and
There is no need to install it on parts where there is no risk of electric shock.

[Effect of idea]

As is clear from the above description, the following effects can be expected from the electrical appliance according to the present invention.

Even if the door panel is used in a place that is touched by people when it is open, it is equipped with an insulating cover that covers the terminals, so workers will not receive an electric shock during maintenance or inspection.

It is economical because the insulating cover can be easily attached and removed from the switch box and does not need to be attached to electrical appliances in areas where there is no risk of electric shock.

Even if the specifications change later and the number of contacts is increased or decreased, the switch box can be easily removed from the base, so changes in specifications can be quickly accommodated.

If you wire with the insulating cover attached in advance, you will naturally be able to wire neatly with the insulating cover in mind.

[Brief explanation of drawings]

1 and 2 are diagrams showing one embodiment of the present invention, in which FIG. 1 is a partially cutaway front view of an electrical appliance according to the present invention, and FIG. 2 is a diagram showing the electrical appliance of FIG. FIGS. 3 and 4 are a partially cutaway side view, viewed from the right side when facing the front panel, respectively, and FIGS. FIG. 6 is a diagram showing two embodiments of an electric appliance according to the prior art, and FIG. 7 is an enlarged perspective view of the main part of FIG. 6. 15; push button (operation part), 20; movable contact, 2
3; Fixed contact, 31; Terminal screw (terminal part), 3
2; base, 33; hole, 34; hanging leg (of the base),
36; switch box, 37; gap, 39; hanging leg (of switch box), 40; hole, 42; insulation cover, 4
6; Guide groove.

Claims (1)

[Scope of Claim for Utility Model Registration] A base that is attached to a panel such as a control panel or a power distribution board and houses an operating section, and a movable contact that is detachably attached to the rear of the base and is opened and closed by the operating section. In an electrical appliance comprising a switch box containing a fixed contact and an insulating cover that covers a terminal part protruding from the switch box, the base has hanging legs having holes on both sides of the bottom protruding from the base. The switch box has protrusions on both sides of the upper part that engage with the holes of the hook legs of the base from the inside, and when the hook legs are engaged with the protrusions, the bottom of the hook legs is inserted. The insulation cover has a guide groove forming a gap on the side, and hooking legs having holes are protruding from both sides of the lower part, and the insulating cover is engaged with the holes of the hooking legs of the switch box at both sides of the upper part. An electrical appliance characterized by having a protrusion and being detachably attached to the switch box.